In a reflector antenna[?], the relative reduction in the effective aperture of the antenna caused by the masking effect of other antenna parts, such as a feed horn or a secondary reflector, which parts obstruct the radiation path.
... Monaco Grand Prix and with driver Jean-Pierre Wimille[?] they won the 1937 and 1939 24 hours of Le Mans.
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1 Under Ettore Bugatti
2 Under Romano ...